Cryptology ePrint Archive: Report 2009/216

Tweakable Enciphering Schemes Using Only the Encryption Function of a Block Cipher

Palash Sarkar

Abstract: A new construction of block cipher based tweakable enciphering schemes (TES) is described. The
major improvement over existing TES is that the construction uses only the encryption function
of the underlying block cipher. Consequently, this leads to substantial savings in the size of
hardware implementation of TES applications such as disk encryption. This improvement is achieved
without loss in efficiency of encryption and decryption compared to the best previously known
schemes.